<template>
      <div class="app-container">
        <el-form label-width="120px">
          <el-form-item label="信息描述">
            <el-tag type="info">excel模版说明</el-tag>
            <el-tag>
              <i class="el-icon-download"/>
              <a :href="'/static/01.xlsx'">点击下载模版</a>
            </el-tag>
          </el-form-item>

          <el-form-item label="选择Excel">
            <!-- 
            ref:表示el-upload这个组件的唯一标识，类似于html标签中的id属性值
            :auto-upload表示是否需要自动上传
            :on-success 上传成功方法
            :on-error   上传失败方法
            :disabled   按钮是否可以被点
            :limit      限制每次可以传的文件数量
            :action     后端接口的地址
            accept      设置你上传文件的格式
            -->
            <el-upload
              ref="upload"
              :auto-upload="false"
              :on-success="fileUploadSuccess"
              :on-error="fileUploadError"
              :disabled="importBtnDisabled"
              :limit="1"
              :action="BASE_API+'/eduservice/subject/addSubject'"
              name="file"
              accept="application/vnd.ms-excel">
              <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
              <el-button
                :loading="loading"
                style="margin-left: 10px;"
                size="small"
                type="success"
                @click="submitUpload">上传到服务器</el-button>
            </el-upload>
          </el-form-item>
        </el-form>
      </div>
</template>

<script>
export default {
    data() {
        return {
            BASE_API: process.env.BASE_API, // 接口API地址
            importBtnDisabled: false, // 选取文件按钮是否禁用,
            loading: false
        }
    },
    created() {
        
    },
    methods: {
        //点击按钮上传文件到接口里面
        submitUpload(){
            this.importBtnDisabled = true
            this.loading = true
            //js:document.getElementById("upload").submit()
            this.$refs.upload.submit()
        },
        //上传成功
        fileUploadSuccess(){
            //提示信息
            this.loading = false
            this.$message({
                type: 'success',
                message: '添加课程分类成功'
            })
            //跳转到课程分类列表
            //路由跳转
            this.$router.push({path:'/subject/list'})
        },
        //上传失败
        fileUploadError(){
            this.loading = false
            this.$message({
                type: 'error',
                message: '添加课程分类失败'
            })
        }
    },
}
</script>